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Commitments and Contingencies (Schedule of Financing Guarantees Outstanding) (Details) - USD ($)
$ in Millions
Apr. 28, 2018
Jul. 29, 2017
Loss Contingencies [Line Items]    
Maximum potential future payments relating to financing guarantees: $ 303 $ 314
Deferred revenue associated with financing guarantees: (122) (134)
Maximum potential future payments relating to financing guarantees, net of associated deferred revenue 181 180
Channel partner    
Loss Contingencies [Line Items]    
Maximum potential future payments relating to financing guarantees: 262 240
Deferred revenue associated with financing guarantees: (90) (82)
End user    
Loss Contingencies [Line Items]    
Maximum potential future payments relating to financing guarantees: 41 74
Deferred revenue associated with financing guarantees: $ (32) $ (52)